<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://pop.h-cdn.co/assets/cm/15/05/54caadcde8fee_-_mining-robot-2-de-77451505.jpg>
<http://www.popularmechanics.com/science/energy/a6095/next-gen-coal-mining-rescue-robot/>